<template>
  <div>
    <input type="button" value="+1" @click="addNum" />
    {{ num }}
    <input type="button" value="-1" @click="subNum" />
  </div>
</template>

<script>
export default {
  data() {
    return { num: 0 };
  },
  methods: {
    addNum() {
      this.num++;
    },
    subNum() {
      this.num--;
    },
  },
};
</script>

<style>
</style>